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Working with the dealer and waiting to hear back but he was going to check other switches to see how the half-moon tang on the tumbler lines up with its counterpart in the lock. My tumbler is the original to my car but the lock was a rebuild so I imagine it's possible that the plate inside might have gotten mixed up during the rebuild. The way mine is now, if turned all the way counter-clockwise to Acc, the half-moon aligns with the grooves in the lock housing when it should line up when in Off.

We’ve finally sussed out the issue with the ignition switch. Although 1955-1956 switches have a different housing due to the way they attach to the dash compared to the 1951-1954 type, they function the same but with the addition of key-start for 1954. However, while the insides can fit one from the other and look identical at a glance, the orientation is different so a 1955-1956 plate assembly was apparently inadvertently used during the rebuild.

Photos courtesy of Mike Chirco of Tucson Packards

In this photo with a 1955-1956 on the left and 1954 on the right, the difference in orientation of the holes where the lock engages with respect to the side pin is quite noticeable.



The contact plates between the two, however, are the same. The rotating Bakelite piece to which the contact plate is attached is the also same but the metal cap on it is not. If anyone has a 1951-1953 switch apart, it would be great to compare what might interchange, especially the Bakelite piece and I expect it's the same too but not sure.

I had a little adventure a while ago. I started up the Patrician by hot-wire as usual as I wanted to move it to make room for the solar panel installation which I hope will be sometime this week. As I wanted to turn it around, I decided to do so by driving by private dirt road to the next driveway, around a tree, then back again which was about two blocks! Even the sometimes-subtly-ticking lifter was quiet by the time I got back and the Patrician couldn't even feel the bumps which are jarring in the golf cart that I usually use.